defender dave Posted January 6, 2013 Share Posted January 6, 2013 hi all i have just fitted a new carb on the quad bike and now when i start it it is fine for about 20 ft then it loses power then if i leave it ticking over for a few secondes its back to full power for another 20 ft .i am hoping someone can help Quote Link to comment Share on other sites More sharing options...
Boris113 Posted January 6, 2013 Share Posted January 6, 2013 Sounds like the carb may be blocked, was it new or secondhand? Would be worth checking a fuel line isn't loose and drawing air in also. Harry edit: just seen you said new- did you fit it in a dirty environment? Quote Link to comment Share on other sites More sharing options...
minimaquinas Posted January 6, 2013 Share Posted January 6, 2013 hi it sounds like a fuel feed blockage to me Quote Link to comment Share on other sites More sharing options...
Nigelw Posted January 6, 2013 Share Posted January 6, 2013 Drawing air or fuel starvation? We had a Bombadier with a Rotax lump in it and it was a whoore of a thing for the fuel starvation if used on full chat for more than a few feet, fitted an electric fuel pump and problem solved, might be totally different for yours though!! Quote Link to comment Share on other sites More sharing options...
Spearos Posted January 7, 2013 Share Posted January 7, 2013 Did you check the float level? Sounds like it could set too low.... Possibly :s Quote Link to comment Share on other sites More sharing options...
Spearos Posted January 7, 2013 Share Posted January 7, 2013 Did you check the float level? Sounds like it could set too low.... Possibly :s Quote Link to comment Share on other sites More sharing options...
Soren Frimodt Posted January 7, 2013 Share Posted January 7, 2013 Could be something as simple as your fuel tank breather being blocked. Easy to check, just try running it without the cap on Quote Link to comment Share on other sites More sharing options...
defender dave Posted January 12, 2013 Author Share Posted January 12, 2013 how do i adjust the float level ? Quote Link to comment Share on other sites More sharing options...
Spearos Posted January 13, 2013 Share Posted January 13, 2013 Normally the float is fixed to a 'hinge' and it's just a case of bending this hinge, which then dictates at what volume of fuel the supply is cut off. What you need to know is what this height should be (setting) for your carb. Different carbs may have different methods for adjusting the float height, but in my limited experiance the above is the norm. HTH Quote Link to comment Share on other sites More sharing options...
GBMUD Posted January 14, 2013 Share Posted January 14, 2013 There will most likely be a drain screw, probably with a pipe on the float chamber. Place a jam jar under the run-off pipe and open the drain screw; fuel should run out at a good pace, filling the jam jar within a minute or so. If not, there is some obstruction to fuel entering the float chamber - check out the fuel filter, fuel pump, look for kinked pipes or some foreign matter in the carb fuel intake or in the float valve. Chris Quote Link to comment Share on other sites More sharing options...
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